ARM64: Preserve x8 and x9 when necessary.

src/arm64/code-stubs-arm64.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1077 matching lines @@
   // Call the native; it returns -1 (less), 0 (equal), or 1 (greater)
   // tagged as a small integer.
   __ InvokeBuiltin(native, JUMP_FUNCTION);
 
   __ Bind(&miss);
   GenerateMiss(masm);
 }
 
 
 void StoreBufferOverflowStub::Generate(MacroAssembler* masm) {
-  // Preserve caller-saved registers x0-x7 and x10-x15. We don't care if x8, x9,
-  // ip0 and ip1 are corrupted by the call into C.
   CPURegList saved_regs = kCallerSaved;
-  saved_regs.Remove(ip0);
-  saved_regs.Remove(ip1);
-  saved_regs.Remove(x8);
-  saved_regs.Remove(x9);
+  CPURegList saved_fp_regs = kCallerSavedFP;
 
   // We don't allow a GC during a store buffer overflow so there is no need to
   // store the registers in any particular way, but we do have to store and
   // restore them.
+
+  // We don't care if MacroAssembler scratch registers are corrupted.
+  saved_regs.Remove(*(masm->TmpList()));
+  saved_fp_regs.Remove(*(masm->FPTmpList()));
+
   __ PushCPURegList(saved_regs);
   if (save_doubles_ == kSaveFPRegs) {
-    __ PushCPURegList(kCallerSavedFP);
+    __ PushCPURegList(saved_fp_regs);
   }
 
   AllowExternalCallThatCantCauseGC scope(masm);
   __ Mov(x0, ExternalReference::isolate_address(masm->isolate()));
   __ CallCFunction(
       ExternalReference::store_buffer_overflow_function(masm->isolate()),
                                                         1, 0);
 
   if (save_doubles_ == kSaveFPRegs) {
-    __ PopCPURegList(kCallerSavedFP);
+    __ PopCPURegList(saved_fp_regs);
   }
   __ PopCPURegList(saved_regs);
   __ Ret();
 }
 
 
 void StoreBufferOverflowStub::GenerateFixedRegStubsAheadOfTime(
     Isolate* isolate) {
   StoreBufferOverflowStub stub1(kDontSaveFPRegs);
   stub1.GetCode(isolate);
@@ skipping 4601 matching lines @@
                               MemOperand(fp, 6 * kPointerSize),
                               NULL);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM64